One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,11)(8,9)(10,12)(13,14,16,18)(15,19,20,17)(21,22,25,28)(23,29,31,26)(24,32,33,27)(30,34,36,35)(5,6,9,8)(7,10,12,11)(13,14)(15,17)(16,18)(19,20)(24,33)(27,32)(30,36)(34,35)(6,8)(10,11)(13,15,16,20)(14,17,18,19)(21,23,25,31)(22,26,28,29)(24,30,33,36)(27,34,32,35)(1,2,3,4)(5,7)(6,10)(8,11)(9,12)(21,24)(22,27)(23,30)(25,33)(26,34)(28,32)(29,35)(31,36)(5,8,9,6)(7,11,12,10)(13,14)(15,19)(16,18)(17,20)(21,22)(23,26)(24,27)(25,28)(29,31)(30,34)(32,33)(35,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.